Drill sharpener



Aug. 11, 1936.

G. C. PEARSON DRILL SHARPENER Filed Aug. 24, 1954 6 Sheets-Sheet 1 Aug. 11, c PEARSON DRILL SHARPENER Filed Aug. 24, 1934 6 Sheets-Sheet 2 lav Span/"$022 ATTORNEY.

A 1936- G. c. PEARSON 2,050,730

DRILL SHARPENER Filed Aug. 24, 1954 s Sheets-Shet 5 IN VENTOR.

Guam; GPea/mm ATTORNEY.

Aug. 11, 1936. G. c. PEARSON DRILL SHARPENER 6 Sheets-Sheet 4 Filed Aug. 24, 1954 INVENTOR. Gamma 61%:2/110/2 Y ATTORNEY.

Aug. 11,1936.

G. c. PEARSON DRILL SHARPENER Filed Aug. 24, 1954 6 Sheets-Sheet 5 1N VEN TOR. mafia/Jon ZQF ATTORNEY.

11, 1936- G. c. PEARSON I 2,050,730

DRILL SHARPENER Filed Aug. 24, 1934 6 sheets-sheet 6 INVENTOR.

Glam!) CPeaman ATTORNEY.

Patented Aug. 11, 1936 PATENT OFFICE DRILL SHARPENER Gustav 0. Pearson, Denver, 0010., assignor to Gardner-Denver Company, Denver, 0010., a corporation of Delaware Application August 24, 1934, Serial No. 741,324

6 Claims.

The present invention relates to improvements in metal working machines, and is more specifically directed to pneumatically operated machines for shaping and sharpening drill steels.

The main object of the inventionis to provide a motive fluid operated machine having two independent motors for performing separate and coacting operations upon the steel, the operation of one being dependent upon the operation of the other.

A further object of the invention lies in the provision of a motive fluid actuated sharpener comprising a forging cylinder and a clamping cylinder, having therein a common piston, and means for controlling the flow of motive fluid into both cylinders, either independently into the forging cylinder or successively into both.

Still another object of .the invention lies in the provision of a second fluid operated tool for upsetting the work held in the sharpener during its clamping operation and theadmission of motive fluid to the second tool being supplied from the clamping cylinder either after or during the clamping operation.

This application is a continuation in part of applicant's co-pending application, Serial No. 510,980, filed Jan. 24, 1931, now Patent No. 2,001,689, issued May 14, 1935, relating to Drill sharpeners.

and to all of these, ends the invention consists fication, claimed and shown in the accompanying drawings in which:

Figure 1 is a side elevation of a fluidoperated drill steel sharpener showing the control valve together with a fragmentary portion, in elevation, of a second fluid, operated work engaging tool positioned thereupon.

Figure 2 is a vertical sectional view on the line drill sharpener with the second fluid operated work engaging tool mounted thereon, both being 1 shown in section.

Figure 5 is a vertical sectional view on the line 55 of Figure 4.

Figure 6 is a horizontal sectional view on the line 6-6 of Figure 2. Y

Figure 7 illustrates a side elevation of the Further objects of the invention will be apparent from the description made hereinafter,

main cylinder showing that portion to which the fluid control valve is secured.

Figure 8 is a vertical sectional view taken on the line 8-8 of Figure 6 showing the main passage for motive fluid from the control valve 5 to the upper face of the large or forging piston.

Figure 9 is a view somewhat similar to Figure 8 taken on the line 99 of Figure 6 showing the passage for motive fluid from the control valve to the upper faceof the smaller or clamping 10 piston, and

Figure 10 shows a section of a fragmentary portion of the main cylinder with the exhaust passage formed therein and communicating with a similar passage in the base leading to the exhaust chamber.

Briefly, the invention herein about to be described is directed to a drill sharpening unit which includes two separate, but coacting, fluid operated work engaging elements. One of said elements constitutes the means for performing the necessary forging and clamping operations necessary in the sharpening of a drill steel. This element includes a pair of cylinders arranged in tandem with a piston in each cylinder. The pistons are connected by a piston rod and movable in unison by motive fluid active upon one of said pistons when performing the forging operation or upon both when clamping the steel during the operation of the second fluid operated work engaging element. This second fluid operated work engaging elementis mounted upon the first and performs certain operations upon the steel during the functioning period of the first work engaging element. This second Work engaging element is hereinafter referred to as adolly hammer and dolly hammer cylinder, and the dolly hammer, when set in operation, upsets the steel firmly clamped by the first work engaging element.

Heretofore in sharpeners of this type it has been customary to provide three distinctive forward movements for the control handle of the motive fluid valve which supplies fluid to the sharpener and to the upsetting tool. Applicant simplifies this by providing a mechanism which necessitates only two forward movements of the handle, and during such movements the operation of the upsetting tool is prevented until at such time when the. steel has been firmly clamped.

These objects are attained by providing tandem. cylinders having a common piston, together with a valve for controlling the distribution of v the motive fluid to either one or successively to control valve to such a position as to permit motive fluid to first enter the forging cylinder, moving the piston down, and then moves the valve to its second position permitting additional mo: tive fluid to enter the clamping cylinder and be active upon the common piston, increasing the active clamping force upon the steel. I A portion of this additionally motive fluid is conducted through a passageway from the interior-of-the clamping cylinder to the second fluid operated tool. 'This passageway opens into the clamping cylinder in such a' relation withthe piston as to insure, when rapid movement of the control mechanism occurs, first, the admission of motive fluid into the forging cylinder, second, the

admission of motive fluid into the clamping cyl-' inder, and finally, the flow ofmotive fluid from the clamping cylinder to the second fluid op-' erated tool.

- LIt 'i's' of course understood that this piston controlled passageway may open into the clamping cylinder at any point within the pressure area of the cylinder, the salient point of the invention residing in the fact that the flow of motive flui'd to the second fluid operated tool, the dolly hammer, does not take place until the steel has been firmly clamped.

Referring to the drawings in detail, the nu-' meral H indicates a cylindrical base including a bottom wall l2 and an outwardly extending annular'flange l3, having at spaced intervals'thereabout openings l4 for th'ereception of bolts, by which the base may be secured to a suitable foundation. Disposed horizontally within the base H, and approximately midway thereof is a:-wall"l5, the central portion of'which is' provided with an upstanding cylinder I6, the upper end being connected by a second horizontal wall I! to the upper'end of the cylindrical wall of the base. The structure thus described serves to divide the base into two chambers l8 and 19, the former constituting a motive fluid reservoir, while the latter, substantially annular, as shown in Figure 3, constitutes an exhaust receiving chamber, hereinafter more fully described.

'Within the chamber l9, and formed'integrally with the wall l5 and the cylinder- I6 is an upwardly inclined brace 20 serving as a reinforced element for the structure, and at the same time constituting a bafiie wall for breaking up the exhaust passing thereover, as will be described later on.- Positioned approximately diametrically opposite the 'brace or baille wall 20 is a vertical wall 2| extending from the lower wall l5 to theupper wall I! and from the cylinder [6 to the base wall, closing the annular compartment at that point, see dotted line in Figure 6. The upperwall IT, as shown in Figure 3, is provided with diametrically. opposite openings 22, the 3 a pipe 23 screwed into a supply passage "24:

" opening into the reservoir.

The top of the base H is provided with an outstanding flange 25, having at spaced intervals suitable openings, and positioned upon the flange and secured thereto by side rods 26 passing through these openings is a cylinder 21. The rods 26 are enclosed within vertical ribs formed exteriorly of the cylinder wall. This cylinder 2] has in its lower-portion a vertically disposed" piston, chamber 28, and above the chamber 28 and formed in the cylinder 21, is an .upper piston chamber 29 of a smaller diameter than the piston chamber 28, and having direct connection herewith.

Movable vertically in the piston chambers 28 'and 29 is a stepped piston body 30, perferably of a single piece, the lower and larger diametrical portion 3| of said body operates in the chamber' 28, and has an upper fluid pressure engaging surface 32. The smaller and upper portion of the body 30 forms a piston 33 operating in 'the smaller piston chamber 29 and having an upper pressure'engaging surface 34. Formedcentrally of the lower face of the body 30 is a depending piston 35 operating within the upstanding cylinder 16. The piston 35 acts in opposition to the pistons 3| and 33, as its lower face is constantly engaged by motive fluid contained in the-chamber'lll.

Mounted on the'top'of the cylinder 21 is a cylinder head 36, secured to the cylinder and base by the side rods 26, and constituting what will hereinafter be referred to .as a lower die blockr The die block 36, as shown more particularly in Figures2 and 3, is provided with a plurality of die seats, one being shown at 31 for the reception of a-suitable' die 38, likewise shown in Figures 2 and 3.

The die block 36 is provided with a rearwardly extending armor'bracket 39 constituting a support for the second-fluid operated tool or dolly hammer 40, having at its front end a steel upsetting and forming dolly 4i.

Positioned 'over'the die block 36 is a movable die block 42, the underface of which is provided with a plurality of die seats, one of which is shown at 43 to receive a die 44 intended to coact with the die 38 positioned in the head 36.

The'movable head 42 is mounted upon the ends of spaced bolts 45, slidably mounted in the head 36, and having their lower ends fixed in the piston body 30. The bolts 45 have spacing sleeves 46 interposed between the upper piston surface 34 and the movable die block 42, thereby maintaining the movable die block, in a fixed relationwith'respect: to the piston body 30.

Motive fluid from any'suitable source is delivered into the reservoir l8 of 'the machine through'the pipe 23 and the supply passage 24 formed in the rear of the reservoir. Motive fluid thus supplied acts constantly against the lower face of the piston 35 tending to maintain it, and the die block 42 connected thereto, in an elevated position.

Formed in the wall of the base I I and extending upwardly from the reservoir I8 is a fluid passageway 41,- communicating with a second passageway 48 formed in the wall of the cylinder 21, the latter leading to an annular chamber 49 formed around a removable valve cage 50, pressed into a valve casing 5|, detachably connected by=bolts" 52 to a flat surface 53 formed upon the side wall of the cylinder 21.

At one side of the chamber 49 is an annular groove 54, and beyond the groove 54 is another annular-groove 55, all being clearly disclosed in Figure 6. The groove 54, as shown. in Figure 8, communicates with a vertical passageway .56, formed in the wall of the cylinder 21, opening into the top of the piston chamber 28, permitting motive fluid when passing therethrough to. impinge upon the pressure engaging surface 32 constituting the upper face of the piston 3|. The annular groove 55, as shown in Figure 9, is in communication with a second passageway 51, opening into the top of the smaller piston chamber 29 and above the pressure surface 34 of the piston 33. The annular chamber 49 and grooves 54 and 55 have communication withthe interior of the valve cage 59 through ports 58.

To control the distribution of motive fluid from the annular chamber 49 to the grooves 54 and 55 there is positioned within the cage 50, for slidable movement, a plunger valve 59 having a centrally reduced neck 69, and end heads 6|. The valve 59 is connected by a link 62 to a hand actuated lever 63 pivoted at its lower end, as shown at 64, to a depending bracket 65 formed integral with the valve casing 5|. To prevent accidental movement of the hand lever there is provided an encircling guard 66' secured to the machine by the bolts 52 serving to connect the valve casing 5| thereto. The guard 66 has pivoted in its front portion a hook 61 adapted to engage a pin 68, carried by the lever 63 to lock the lever and valve in an off position.

Communicating with the interior of the smaller piston chamber 29, as shown in Figure 4, is a passageway 69, having screwed therein a nipple 19 which extends through the wall of the cylinder 2'! and has connected thereto a flexible conduit II leading to the intake port 12 of the second fluid operated tool or dolly hammer 40 mounted upon the outer end of the.

bracket 39. It will be observed in Figure 4 that the passage '69 opens into the interior of the piston chamber 29, and it will thus be evident that when additional motive fluid is admitted into the cylinder, through the movement of the control valve 59, it will pass on to the dolly,

hammer cylinder, thus setting this unit into operation and performing its intended work upon the steel. This arrangement permits the operation of the dolly hammer only at such periods as when the steel or work is securely clamped by both pistons 3| and 33. The passage 69 is closed completely by the piston 33 when the die block 42 is elevated.

As shown in Figure 5, the dolly hammer cylinder supporting bracket 39 has its upper face concaved longitudinally, as shown at 13 to receive the convexed face of the dolly hammer cylinder base 14. The base 14 is provided on opposite sides with longitudinal flats 15, the upper faces of which are engaged by the hooked end 16 of a yoke member 11, resiliently connected to the bracket 39 for vertical movement by bolts 18, and locked in its lowermost or holding position by a locking screw 19. With this structure all that is'necessary to move the cylinder 49 longitudinally of the bracket 39, is to loosen the locking screw I9, and by reason of certain resilient elements carried by the bolts 18, the yoke 11 will be moved upwardly, releasing its binding action upon the flats 15 of the dolly cylinder base.

Assuming that motive fluid is supplied to the reservoir it will be evident by referring to. Figures 1 and 2 that it has constant access to the interior 'of the upstanding cylinder therefore constantly bears against the lower face of the piston 35 maintaining the piston, and the die block'42, moved thereby, upwardly. The diameter of the piston 35 when acted upon by the motive fluid, is suificient to move with it the piston body 30 and the upper die block 42.

Should the control valve 59 be. in its closed position, motive fluid in the reservoir l8, passages 41 and 48, and annular chamber 49, is-

held against distribution to the various ports formed in the valve casing by the heads of the valve. However, movement of the valve 59 to the position shown in Figure 6, permits motive fluid to flow from the annular chamber 49 through the ports 59, around the reduced neck 6| of the valve, through the ports 58 of the valve cage into the annular groove 54 from which it passes through the passageway 56 into the loweu or larger piston chamber 28. where it engages the upper pressure surface 32 of the piston 3|, moving the piston body downwardly, and at the same time moving the movable die block 42 down into coacting relation with the lower die block 36. Due to the enlarged area of the pressure engaging surface 32 over that of the return piston 35, fluid 'will move the piston body 39, and the die block 42, down into contact with the lower die block 36 with sufficient force for forging and shaping the work. Leakage of motive fluid past the piston 3| is permitted to escape through the openings 22, arranged in the wall into the chamber l9 and finally to atmosphere as will be apparent later on in the description. By rapid reciprocation of the valve within certain limits, sufl'iciently to form connection between the chamber 49 and the groove 54, and alternately open the groove 54 to atmosphere through the end of the valve as hereinafter described, the upper die block can be made to reciprocate rapidly to impart a series of blows in the forging or shaping operation of the work.

Following the forging or shaping operations should the operator desire to firmly clamp the steel or work between the stationary die block 36 and the movable die block 42, so that it might be further worked upon by the dolly 4|, actuated by the hammer 40, the valve 59 is moved to the second of its functioning positions, permitting the continued flow of motive fluid as described above and. also the passage of motive fluid from the annular chamber 49 through the ports 58, aroundthe reduced neck 60 of the valve, and through the ports 58 to the second annular groove 55 from which it passes through the passageway 51, as shown in Figure 9, to the upper face of the smaller piston 35, impinging upon the pressure surface 34, thereby giving to the piston body 30 the maximum downward pressure equivalent to the pressure of the fluid bearing upon both piston areas 32 and 34. After or during the admission and expansion of motive fluid in the chamber 29, a portion passes therefrom, through the passageway 69 and conduit II, to the dolly hammer 4|}, setting it in operation to act upon the Work clamped between the two die blocks. Upon the movement of the actuating lever 63 to the left the valve is, of course, moved backwardly cutting off the supply of motive fluid to the annular groove 55, and as the head 6| of the valve 59 moves over the groove 55 it is obviously opened to atmosphere, thus. permitting the exhaust. of motive fluid from the piston chamber .29.. A further-backward movement of the valve 59 percommunicates intermediately of a horizontally;

disposed passageway 85 formed within the wall of the cylinder 21, se'e Figure 6. One branch 86. leads to an exhaust chamber 81 formed in'the mits the exhaust from the piston chamber 28- to passto atmosphere in a like manner. Upon the completion of the exhaust from both chambers 28 and 29, the piston 35 ispermitted to act, elevating the body piston 30 and'the upper die block 42.

Tomufiletheexhaust passing out of the cylinders 28 and 29; together with that constantly passing from the dolly hammer 49 when in operation, the chamber l9 formed in the base II, is-used as an exhaust chamber into which the exhaust is admitted and permitted to expand.

prior to its admission to atmosphere.

As shown in Figures 2 and 3, the chamber i9 is provided with'anexhaust inlet 8i, and an exhaust outlet 82 adjacent thereto, but separated by. the wall 2| formed in the chamber. It is evident that upon the admission of the exhaust through the inlet 8! it enters into .the large annular chamber l9 where expansion takes place, breaking it up sufficiently to muiile the sound prior to its admission to atmosphere. the exhaust has entered into the chamber I9 it seeks its way around the annular chamber and out to atmosphere through the port 82 in the rear of the machine. Extending upwardly through the wall of the. base II is a passageway 83' communicating with a similar passageway 84 formed in the wall of.

the cylinder 21. This vertical passageway 84 valve casing 52 and in the rear of thecontrol valve. The other branch 88 communicates with a second vertically disposed passageway-89, likewise formed in-the wall of the cylinder 21. This passageway 89 is in communication with a passageway 99v formed within thebracket 39, open--, ing into an exhaust chamber 9| in the base of the dolly hammer cylinder 40, and into which exhaust from the hammer cylinder is permitted to pass during its operation. 7

From the foregoing it will be evident that.

during the operation of the dolly hammer, exhaust therefrom. passes fromthe cylinder into the exhaust chamber: 9|, through the passageways 99, 89, 88, .84, and 83,. and port 9| into.

chamber l9 through the port 8!. Following-its entrance into the chamber I9 itwill. be broken up in the manner herebefore described. By reason of the openings 22 formed in the upper wall ll of the chamber [9 the-exhaust during its expansion engages the under face of the piston body 38, acting thereupon to assist the piston 35 in returnof the elevatedposition. i To lubricate the machine only serves as a reservoir for motive fluid,'but as a lubricant'container, and in view of'the elevated position assumed by the supply passage 24, lubricant may be placed within the reservoir through a filling opening closed by'a plug 92 After die block 42 to its the chamber l8 not untilitassumesa level indicated by the linexfAfi in Figure2. To saturate the=incoming motive fluid there is provideda nozzle 93' extending I vertically, and transversely,-.of. the passage 24.

The nozzle 93 is provided with suitable passages so that'as motive fluid passes around its body a. suction may be created therethrough, drawing up lubricant from the bottom portion of the reservoir and discharging it into the line of flow; Motive fluid thus saturated with lubricant passes'upwardly to the controlvalve and hence into the several piston chambers and dolly' hammer cylinder, depositing in'each a suflicient quantity oflubricating' oil. 1 To. provide sufii'cient oil upon thebolts' 45 carried by, the piston body 30, and extending upwardly through the die block 31, the upperfaceof the movable die block 42 has formed centrally thereof a lubricant well 94, closed at its upper end by a plug 95. The lower end of' this well 94 hascommunicating therewith a plurality of upwardly diverged passageways 99 which serve to convey lubricant from the well 94 to the rods 45,- where it ultimately-passes down and lubricates sufficientlythe wearing surfaces of the rods and sleeves-46.

As shown in Figure 2, the bottom wall l2 of the base is slightly inclined, and at its lowermost portion there is provided a drain opening 91, closed by a removable plug 98.--

From the foregoing it is thought that the construction, operation and many advantages of the herein'described invention will be apparent to those skilled in the a'rt'without further descrip-' tion, and it will be understood a that various changes in the size, shape, proportion'and minor details of construction may be resorted to withoutdeparture from'the spirit or-sacrificing any of the advantages of the invention.

What I claim is:'

fabricating units coactive at times upon the work, one of said units including a fluid actuatedmotor having a piston, a workengaging' member earned by the piston and movable to at least two 40 1. A drill sharpener comprising a pair of work functioning positions, means controlling the'flow of fluid'tothe motor, a fluid passageway from the motor to the other of said units, and said piston when in oneposition permitting the flow of fluid through said passageway.

2. A drill sharpener comprising a pair of fluid actuated work fabricating units coacting'upon the work, one of said-units including a piston having two correspondingly positioned surfaces engageable by active fluid, means permitting thepassage of fluidto said surfaces independently to one and successively to both, a fluid passageway leadingfrom one 'unit to the other,'and said pistonwhen moved byfiuid active upon one surface exposing the passageway to the other unit for. the passage of a portion of the operating fluid subsequently engageable with the other of said surfaces.

3. A forging machine-including a fluid actuated work fabricating unit'having a piston, a member carried thereby and engageable with the work for performing several operations thereupon, a second fluid actuated work fabricatingunit coacting with the first unit for performing jointly one of saidop'erations, a valve mechanism controlling the flow of fluid to the first unit to impart motion to the piston and movable member for performing its several operations, afluid passageway leading from the piston contained unit to the otherunit. said-passageway being opened and closed by said piston and. said piston and movable member when performing one of said operations permitting the unrestricted flow of fluid through said passageway to the other work fabricating unit during the performance of another operation.

4. A forging machine including a pair of op posed work forming dies, one of which is movable with respect to the other, a piston connected to a movable die and positioned within a cylinder, said piston having separate faces engaged by motive fluid admitted into the cylinder, a Work engaging element positioned upon the machine for action upon the work clamped between the dies, said element being actuated by fluid admitted thereto through a passageway leading from the cylinder, a valve mechanism controlling the flow of fluid to the faces for varying the force exerted upon the work, and said piston when moved by fluid active against one face uncovering the passageway permitting a portion of the fluid when active against the other face to pass to the second work engaging element.

5. A drill sharpener comprising a pair of fluid actuated work engaging elements adapted. to coact at times upon the work, one of said elements including a pair of cylinders and a piston common to both, said piston having a head in each cylinder and when moved by fluid active thereupon capable of performing at least two distinct functions upon the work, a passageway connecting one of said cylinders with the other of said elements, a valve movable to two positions for controlling the flow of fluid to the cylinders, said valve when moved to one position permitting a flow of fluid upon the head in one cylinder for moving the piston to perform one 5 operation and when moved to its other position permitting a flow of fluid upon the heads in both cylinders for increasing the active force upon the piston during the performance of its second operation, and said piston during its movement 10 to perform the first said operation uncovering the passageway leading to the other of said work engaging elements for the passage of fluid to the other of said elements when performing its second operation. 15

6. A drill sharpener comprising a pair of fluid actuated work engaging elements one of which includes a pair of cylinders, a common piston having a head in both cylinders, a die block integral with said piston, said piston moved by fluid 0 active upon the heads to bring the die block in contact with the work for forging and clamping operations, the other of said elements operating upon the work when clamped by the first element, a passageway connecting one of said cyl- 25 inders with the other of said elements, a valve controlling the flow of fluid to one cylinder for the forging operation and to both cylinders for the clamping operation, and said piston during the clamping operation permitting the flow of 30 fluid from one cylinder to the other of said work engaging elements.

GUSTAV C. PEARSON. 

